Sheet-metal pipe



. (No Model.)

2 Sheets-Sheet 1. C. HAMLIN. 1 SHEET METAL PIPE- No.'507,709. Patented001;. 31,1893.

wibmm. I V y d 3mm 5 WQ W W4 (N0 Model.) 2 Sheets-Sheet 2.

C. S. HAMLIN. SHEET METAL PIPE.

No. 507,709. P Patented 0ot. 31,1893.

UNITED STATES PATENT OFFICE.

CHARLES S. HAMLIN, OF LOS ANGELES, ASSIGNOR OF ONE-HALF TO ARTHUR C.HARPER, OF UNIVERSITY, CALIFORNIA.

HSHE/ET-METAL PIPE.

SPECIFICATION forming part of Letters Patent No. 507,709, dated October31, 1893.

Application filed June 1, 1893. Serial No. 476,260. (No model.)

To all whom it may concern.-

Be it known that I, CHARLES S. HAMLIN, a citizen of the United States,residing at Los Angeles, in the county of Los Angeles and 5 State ofCalifornia, have invented new and useful Improvements in Sheet-MetalPipes, ofv which the following is a specification.

The object of my invention is to produce a cheap, strong and durablepipe, suitable for [0 conveying water, 850. a

My invention is especially adaptedfor use in preparing pipe from thinsheet metal formed into convolute or partially convolute rolls andspirally wound with wire or strap My invention broadly stated comprisesa pipe consisting of a plate of sheet metal bent upon itself to form twoleaves, and having its inner leaf of greater length than its outer leafand projecting equally beyond each end of the outer leaf, and having itsouter leaf of greater width than such inner leaf, the two leaves beingrolled into tubular shape and the projecting ends of the inner leafbeing turned outward over the ends of'the outer leaf to cover the jointbetween the two leaves, and suitable'means for retaining the pipe inshape.

My invention also comprises a pipe consisting of a plate of sheet metalbent upon itself to form two leaves, and having its in-- ner leaf ofsuit-ablewidth to form the sized pipe desired, and having its outer leafof greater width than its inner leaf, the'two leaves being rolledintotubular shape; an S- shaped lap strip having one of its folds arrangedembracing the bent edge of the two leaves and having its other foldarranged embracing the single edge 'of the inner leaf a suitablewrapping arranged -to retain the pipe in shape, and the whole coveredwith a coating of preservative material.

My invention further comprises a pipe consisting of a plate of sheetmetal bent upon itself to form two leaves, and having its inner leaf ofgreater length than its outer leaf and projecting equally beyond eachend of the outer leaf, and having its outer leaf of greater width thanits inner leaf, the two leaves being rolled into tubular shape; an 8shaped lap strip having one of its folds arranged embracing the bentedge of the two leaves, and having its other fold arranged embracing thesingle edge of the inner leaf, the projecting ends of the inner leafbeing turned outward over the ends of the outer leaf; a suitablewrapping of wire arranged to retain the pipe in shape, and the wholecovered with a coating of preservative material.

My invention further comprises various combinations and arrangement ofparts hereinafter fully set forth.

The accompanying drawings illustrate my invention.

Figure 1 is a plan View of a sheet of metal cut into shape ready to befolded upon itself to form alength of my improved pipe. Fig. 2 is a viewof the same with the inner leaf folded upon the outer leaf, and ready tobe passed through the rolls and formed into tubular shape. Fig. 3 is anend view of the sheet formed into tubular shape ready to be Wrapped.Fig. 4 is a fragmental side elevation of the same in a differentposition fromthat shown in Fig. 3.- Fig. 5 is a fragmental perspectiveView of one end of a plpe constructed according to my invention,illustrating my improved means for securing the end of thewire wrapping.Fig. 6 is a fragmental side elevation of a completed pipe embodying myinvention. Fig. 7 is a longitudinal fragmental sectional view of my1mproved'lap joint; line x:1: Fig. 3 indicates the line of section. Fig.8 is a cross section of the same on line y-y Fig. 7. Fig. 9 is afragmental cross section of a modified form of. joint."-

' In the drawings, A'represents thesheet of metal which is cut into theshape shown in Fig.1, and is then folded as shown in Fig. 2 to form theinner leaf a and the outer leaf or. The outer leaf a is of greater widththan the inner leaf a to form a lap joint, and to assist in retainingthe pipe in shape. The inner leaf is longerthan the outer leaf asillustrated in Figs. 1, 2 and 5, to allow the projecting end to beturned back over the end of the outer leaf a to form an end cap a" whichprevents the entrance of any water from the end of the pipe into thejoint between the leaves of :ca

sheet metal. This construction is clearly illustrated in Fig. 7, wherethe cap is shown in section. This cap also forms a smooth end for thepipe in addition to making a water tight joint at the end,and alsoassists in binding the two leaves together and holding the pipe in shapewhen the joints are driven together when the pipe is laid. In order togage the diameter of the pipe, and also to provide means for preventingthe inner edge of the inner leaf from springing outward into the pipe, Iprovide one edge of such inner leaf with a suitable edge receiving seatadapted and arranged to receive and seat the other edge of such leaf. Asshown in the drawings, this seat consists of an S shaped lap strip Bwhich is formed of sheet metal and has one fold 1) arranged upon andembracing the bent edge a of the two leaves, and has its other fold barranged upon and embracing the single edge of the inner leaf a. Thisedge receiving seat may be formed integral with the single edge of theinner leaf, if desired, as shown in Fig. 9, and I do not limit my claimsto the use of the independent S shaped lap strip.

In wrapping pipe with wire, difficulty has been experienced in providinga suitable fastening for securing the ends of the wire upon the pipe,and various means have been devised to produce a suitable fasteningtherefor.

I provide an improved fastening for wire wound metal pipe consisting oftwo or more thicknesses of sheet metal, which consists essentially of awire C, having one end provided with a rivet receiving loop 0 andinserted beneath the outer leaf of the pipe (as shown in Fig. 4) whenthe pipe is formed, thence passing spirally around the pipe to the otherend thereof, and provided at such other end of the pipe with an endreceiving loop 0 formed in the wire, thence passing one or more timesaround the pipe beyond such loop and having its end 0 passed throughsuch loop and secured by bending the wire backward upon itself. This isillustrated in Fig. 5. After the pipe is formed, a rivet 0, (shown indotted lines in Fig. 6) is inserted through the wall of the pipe,passing through the loop a, and is riveted, thereby securing the otherend of the wire between the two leaves of the pipe. By this means Iprovide a secure fastening for the wire and one which can be madequickly and cheaply.

In practice the sheets are prepared for making the pipe by cutting theminto the form shown in Fig. 1, then bending the sheet upon itself tobring the two leaves together as shown in Fig. 2, then starting thereversely bent edge a of the two leaves into the former rolls andforming the leavesinto tubular shape as illustrated in Fig. 3; beforethe reversely bent edge a enters the roll upon its second round, the Sshaped lap strip B is placed upon such edge with its inner foldembracing the edge in the manner shown in Fig. 3. Then, as the rollsrevolve, the single edge of the inner leaf a is brought into position bythe action of the rolls and is inserted into the outer fold of the Sshaped strip as shown in Fig. 3. Then the joint thus formed is passedthrough the rolls which tightens the lap strip firmly upon the two edgesand forms a tight joint. After the lap strip has passed through therolls and before the free end of the outer leaf is carried in betweenthe rolls, the end of the wire wrapping O which is provided with theloop 0 is inserted between the outer leaf and the body of the pipe, withthe loop in the position shown in Fig. 4. Then the rolls are revolved tocarry the pipe around and the wire is wrapped spirally around the pipeas shown in Figs. 5 and 6 until the other end of the pipe is reached,suflicient tension be ing placed upon the wire to cause it to bind uponthe pipe firmly; when the other end of the pipe is reached, a loop 0' isformed in the wire, as illustrated in Fig. 5 and the wire is carriedbeyond the loop one or more timesthe two ends are lapped past eachother.

and rest in the lap strip as shown in Fig. 3, and when pressure isapplied upon the exterior of the pipe, as in wrapping, the two endsresting in the loops of the lap strip, prevents the pipe from beingreduced in diameter by such pressure. The lap strip also holds the inneredge of the pipe from springing out into the pipe, which sometimesoccurs in ordinary wire wrapped convolute sheet metal pipe.

The sheet metal plates are lightly coated with asphaltum before beingformed into pipe, and melted asphaltum is applied to the joint before itis covered by the outer leaf, and the completed pipe is also dipped inmelted asphaltum which fills the seams of the joint and absolutelyprevents leakage.

The end cap a prevents the entrance of water between the leaves from theend of the pipe, and the over-lapping end of the outer leaf strengthensand protects the joint so that my improved pipe will stand a heavypressure without liability of leakage, although made of thin light iron.

Now, having described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. The pipe set forth, consisting of a plate of sheet metal bent uponitself to form two leaves, and having its inner leaf of greater lengththan its outer leaf and projecting equally beyond each end of the outerleaf, and having its outer leaf of greater width than its inner leaf,the two leaves being rolled into tubular shape and the projecting endsof the inner leaf beingturnod outward over the ends of the outer leaf tocover the joint between the two leaves and suitable means for retainingthe pipe in shape.

2. The pipe set forth, consisting of a plate of sheet metal bent uponitself to form two leaves, and having its outer leaf of greater widththan its inner leaf, and having one-of the edges of the inner leafprovided with a suitable edge receiving seat adapted and arranged toreceive and'seat the other edge of such leaf, the two leaves beingformed into tubular shape, one edge of the inner leaf be lng seated inthe seat provided upon the other edge of such leaf, a wrapping of wirewound around such pipe, and the whole covered with a coating ofpreservative material.

3. The pipe set forth, consisting of a plate of sheet metal bent uponitself 'to form two leaves, and having its inner leaf of greater lengththan its outer leaf, and having its outer leaf of greater width than itsinner leaf, one of the edges of the inner leaf being provided with asuitable edge receiving seat arranged to receive and seat the other edgeof such inner leaf, the two leaves being rolled into tubu lar shape andthe projecting ends of the inner leaf being turned outward over the endsof the outer leaf, and a suitable fastening arranged to retain the pipein shape.

4. The pipe set forth, consisting of a plate of sheet metal bent uponitself to form two leaves, and having its inner leaf of suitable,

width to form the sized pipe desired, and having its outerleaf ofgreater width than its inner leaf, the two leaves being rolled intotubular shape; an S shaped lap strip having one of its folds arrangedembracing the bent edge of the two leaves, and having its other foldarranged embracing the single edge of the inner leaf; a suitablewrapping arranged to retain the pipe in shape, and the whole coveredwith a coating of preservative material.

5. The pipe set forth, consisting of a plate of sheet metal bent uponitself to form two leaves, and having its inner leaf of greater lengththan its outer leaf and projecting equally beyond the ends of the outerleaf, and having its outer leaf of greater width than its inner leaf,the two leaves being rolled into tubular shape; an S shaped lap striphaving one of its folds arranged embracing the reversely bent edge ofthe'two leaves and having its other fold arranged embracing the singleedge of the inner leaf, the projecting ends of the inner leaf beingturned outward over the ends of the outer leaf; a suitable wrapping ofwire arranged to retain the pipe in shape, and the Whole covered with acoating of preservative material.

6. In a sheet metal pipe consisting of two or more thicknesses of sheetmetal, the wire wrapping, having one end provided with the rivetreceiving loop and inserted beneath the outer leaf of the pipe when thepipe is formed, thence passing spirally around the pipe to the other endthereof, and provided at such other end of the pipe with an endreceiving loop formed in the wire, thence passing one or more timesaround the pipe beyond such loop and'having its end passed through suchloop ,and secured by bending the wire backward

